SO Insider Filing: David Grain Adds 817.51 Deferred Units, Ownership Now 82,199.54

Rhea-AI Filing Summary

David J. Grain, a director of Southern Company (SO), reported an acquisition of 817.5105 Deferred Stock Units on 10/01/2025. The units were granted under Southern's Deferred Compensation Plan and are payable in common stock only upon termination; there is no exercise or expiration date. The reported transaction increases Mr. Grain's total beneficial ownership of Southern common stock to 82,199.5392 shares (direct ownership). The Form 4 was signed by an attorney-in-fact on 10/02/2025.

Positive

• 817.5105 deferred stock units acquired under the company's Deferred Compensation Plan
• Beneficial ownership increased to 82,199.5392 shares, showing alignment with shareholders
• Units payable in stock only upon termination, indicating long-term retention design

Negative

• None.

Insights

Corporate Governance Analyst

Director received deferred stock units payable at termination, increasing direct share count.

The filing shows a routine, non-cash compensation event: 817.5105 deferred stock units awarded under the company's Deferred Compensation Plan and recorded as an acquisition on 10/01/2025. These units vest/payable in stock only upon termination and carry no exercise or expiration date, so they represent future-controlled equity rather than immediate stock transfer.

This change raises the reporting director's direct beneficial ownership to 82,199.5392 shares, a disclosure relevant for ownership concentration and insider alignment with shareholders.

Executive Compensation Specialist

Compensation granted in deferred stock units aligns pay with long-term ownership and deferral rules.

The transaction is described as compensation under the Deferred Compensation Plan with payment in stock upon termination, indicating a deferred equity-based payout rather than an option or cash award. No price or exercise terms apply, and the reported per-unit value shown ($94.8) appears as a reference to an underlying share value at reporting, not an exercised price.

This is a standard mechanism to retain executives/directors and link pay to company equity over time.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

GRAIN DAVID J

(Last) (First) (Middle)

30 IVAN ALLEN JR. BLVD., NW

(Street)

ATLANTA GA 30308

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
SOUTHERN CO [ SO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Deferred Stock Units Holding(1)	$0	10/01/2025		A		817.5105		(1)	(1)	Southern Company Common Stock	817.5105	$94.8	82,199.5392	D

Explanation of Responses:

1. Acquired pursuant to Southern's Deferred Compensation Plan, payable in stock only upon termination. There is no exercise or expiration date.

	/s/ Brittney Anderson, Attorney-in-Fact for David J. Grain	10/02/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did David J. Grain report on the Form 4 for SO?

He reported acquiring 817.5105 Deferred Stock Units on 10/01/2025 under Southern's Deferred Compensation Plan.

How will the deferred stock units be paid?

The units are payable in Southern Company common stock only upon termination and have no exercise or expiration date.

What is Mr. Grain's total beneficial ownership after the transaction?

The filing reports total beneficial ownership of 82,199.5392 shares (direct) following the transaction.

When was the Form 4 signed and filed?

The Form 4 was signed by an attorney-in-fact on 10/02/2025 and the transaction date is 10/01/2025.

Is there a cash price or exercise price for these units?

The filing indicates no exercise or expiration date; the units are deferred compensation payable in stock, not options with an exercise price.